Warning during compilation - variable not initialised

The compiler throws a warning while updating the package.

My install is R 3.6.1 with x86_64-suse-linux-gnu platform (OpenSUSE Leap 15.1). I was installing airGR 1.3.2.42 from Lyon 1 CRAN repository. The compiler is GNU Fortran 7.4.1.

The message is the following :

gfortran -fno-optimize-sibling-calls  -fpic  -fmessage-length=0 -grecord-gcc-switches -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection  -c frun_cemaneige.f -o frun_cemaneige.o

frun_cemaneige.f:115:0:

IF (G.LT.Glocalmax.AND.Gratio.EQ.1.) Glocalmax=G !Update in case of potential melt and G lower than Gseuil
 
Warning: ‘glocalmax’ may be used uninitialized in this function [-Wmaybe-uninitialized]

As far as I can understand the source code in frun_cemaneige.f, this is unlikely to create a bug, as glocalmax is initialised and used only when IsHystBool is set to TRUE.